Am very sorry, I am not an expert on this. I wouldn't know where to look and what to do. It sounds pretty much as a newbie, I know...
But I don't want to mess things up.
If my memory serves me well, way back, when I was still using Firefox (yes, it sounds like cursing here...) there was a way to launch that browser in a 'safe' mode, hence without all extensions, or whatever. More or less default.
FWIW software info
Windows 10 x64 1903 (18362.388)